1.py

class A(object):
    def __init__(self):
        print "A init"

class B(A):
    def __init__(self):
        print "B init"
        super(B, self).__init__()

class C(B):
    def __init__(self):
        print "C init"
        super(C, self).__init__()

# If you only want to super the A.__init__() and skip B
class D(B):
    def __init__(self):
        print "D init"
        grandparent = super(B, self) # start the super call from B, not D, to resolve B's parent instead of D's
        grandparent.__init__()

shell_output.txt

>>> a=A()
A init

>>> b=B()
B init
A init

>>> c=C()
C init
B init
A init

>>> d=D()
D init
A init